Double-wall box and method of making the same



@et 23 i923. LNAH E. W.VLABOMBARDE -DouLE WALLy Box AND METHOD oF MAKING THM SAME Filed April 10 MVM/5Min?- E LAE LAEDMEARDE;

E YC///W Arm/@vin Patented ct. l223, 1923.

ELIE lW. LABOIVIBARDE. OF NASHUA,v NEW .HAMPSHRE noBLE-WALL :Box AND METHOD or MAKING THE SAME. Y

Application led April 10, 1922. Serial No. 551,031.

To all whom t may concern:

Be it known that I, ELIE W. LABOMBARDE, a citizen of the United States, and resident of Nashua, in the county 'of Hillsboro and State of New Hampshire, have invented certain new and useful 4Improvements in Double-fall Boxes and Methods of Making the Same, of which the following is a specification.

This invention relates to boxes made of paper stock of the kind usually referred to as box board, and has particular reference to boxes made of blanks marginal portions of which are adapted to form double-thick side and end walls.

One of the objects of my present invention is to provide boxes of this type which can be stored or shipped in flat condition and can then be quickly set up or converted to well-secured receptacle form by the users,v

when wanted, without requiring any adhesive to hold them in set up condition.

Another obj ect is to provide an economical method of manufacturing the blanks with portions which will interlock, when set up, and will reliably remain inter'locked.

With these and other objects in vieW, the invention consists in the method and in the blank and box substantially as hereinafter described' and claimed. 1

Of the accompanying drawings Figure l is a plan view of one end p'ortion of a blank formed according to my invention, it being understood that the other end (omitted to reduce space) will be a duplicate of the end illustrated.

Figures 2, 3, 4 and 5, arev sectional perspective views illustrating successive steps in the formation of a box member.

Figure represents a section on line 6 6 of Figure 5 von a larger scale.

lSimilar reference characters designate similar parts in all of the views.

Referring first to Figure 1, the box board is cut and creased to form a blank comprising a central portion 12, side wall sections 13, 14, and end wall sections 15, 16, the latter having an edge flap 17. The ends 'of section 13 have foldable tongue flaps 18, and the ends of sections 14 have foldable tongue flaps 19. While the'sections 13, 14,

' are of substantially equal Width, the fiaps 19 of the outer wall sections 14 are of considerably less width than the flaps 18 of The dotted lines designated by reference letters m to la, inclusive represent the lines along which the blank is creased when made.

The outer wall sections 14 have edge notches or recesses 20, and enclfnotches or recesses 21, the'latter being cut away to a point slightly past the line of crease d. These recesses are to aid in the interlocking of the wall sections as will be explainedin connection with Figures 5 and 6.

When the blank is cut each end flap or section 17 has one or more extensions or tabs 22 transversely creased as at z.. Preferably there are three of such tabs as illus-l trated in Figure 1, but obviously there may be but one in which case that one would be nearly if not quite as long as the flap 17.

I will now describe the method of treating the blank to prepare it for conversion to locked set up condition, said treatmentv including the transfer of the end tabs 22 onto the central portion12 and securing them there in accurate'positions to present locking members.

The side wall sections 14 are folded onto the sections 13 and adhesively secrevd theref to (Fig. 2) the tongues 18, 19, being left loose, as flaps. At or about the same time the end sections 16 are folded over onto sections 15, the flaps 17 and their tabs reach- Y ing onto the portions 12. Before this, by

to outward position as in Figure 4, after l which a second cutting operation, as by a disk knife Y, trims away the remaining portions of the tabs so as t'o leave the vsection 17 with a straight edge.

The reason for cutting on two lines is to remove enough of the tabs between the glued areas and the edge of the section 17 to avoid crowding when the sections 17, 16

vand 15 are bent'on the lines g, f, e, to the angular form shown in Figure 5.

I do not limit myself to performing the cutting operations successively, in order to remove portions of the tabs, as the entire width 'of the portions to be out away may Mill( be lremoved `by cutting operations simultaneously performed or by a single cutter of'requisite width. l

@wing 'to the fact that o nly those areas of the tabs betweentheir tip edges and the crease lines hare gluedto the portions 12, the unglued areas or lips 22a on the other sides of the lines 71, (Figs. 4, 5 and 6) are free to permit the edge of the section 17 to extend thereunder when theblank is set up as presently4 described.

When the blanks are finished for storage or shipment, they are in` the condition shown by Figure 4 b'ut with the edge of section 17 trimmed straight. Then, when a blank is to be set up for use, the sections 14, 13,

already glued together, are turned up per-y pendicular to the central' portion 12, the tongue flaps 18, 19;, are turned in as indicated by dotted lines in Figure 5, Vand the end sections 15, 16 are folded up and Vover the naps 18, 19, andthe edge of section 17J is snapped under the free lips 22EL of the members 22 which now form stops or catches for said edge of section 17, At the same time, the ends of sectionY 17 extend into the recesses 20 of sections 14.

The reason for making the flaps 19 nartower than the flaps 18 is best illustrated by Yllligure 6. By comparing Figures 5 and 6 it will be' understood that eac-h end portion of section 16 extends down inside of so" as to overlap two thicknesses of material viz: two daps 18 19. The lower edge of Hap 19, being now higher than the lower edge of ldap- 18, the section 16 is necessarily somewhat curved or bent back (see`Fig. 6) 'when'section 17 is engaged by the stop or lock lips 22". As the material of which the blank is made has a normal tendency vto spring back to dat or straight condition; unless scored or creased, the licking of section 16. in order to snap the edge of section 17 into locking engagement with the lips 22a, causes .said edge of section 17 to always possess a tendency to retain said lockingengagement. Unlocking can only 'be ed'ected by a determined enort to push or spring back the section 17 throughout its lengthy and then, while so pushing it back, lift its edge clear of the lips 22fl and its ends clear from the u recesses 20, 21. As the section 1'?, when bent as shown by Figures 5 and 8, has a constant tendency to bear down on the section 12, adds to the diiiculty of unlocking the partso i care andpatience the folded parts can beaunlocked, but it is practically impossible for even a. partial unlocking 'to occur acci-` dentally.

The described method of making the blanks by rst providing the sections 17 with extension tabs 22 and then folding them over and gluing the tabs to the bottom or central section 12 and then' cutting across the tabs, possesses the important advantage of rendering it impossible for said tabs to be secured in other than, accurate positions to Ilock the edge of sect-ion 17 when a completed blank is setup for use. rlhis is because the saine crease lines which dene i the temporary first folds prior to the adliesive connection of the tabs with the portion. 12 also define the folds' when the blanks are later folded to receptacle form.

lvl/hen the blanks have been completed as application filed concurrently herewith, Se-

rial No. 551,030 if the boxes made from the blanks are to be used for 'containing substances such as referred to in thatapplication.

ll do not limit myself to' portions of the blank or bon illustrated, nor toy any specific use for the boxes. And is to be understood that the terms side and fend are employed solely for the sake of brevit4 of description, and not for purposes of` imitation.

Having now described my invention, l claim:

1. A box blank comprising a central por-k tion having foldable side and end walli sections, the side wall sections-having tongue flaps to be engaged inside the end wall sections when the latter are folded, said end wall sections having edge portions to bear on the centra-l portion when folded, the tongue flaps being proportioned to permit the lower `inside portions of the end wall sections to be flexed back under said tongue flaps, and locking sto-ps carried by the centrall portion in position to necessitate the flexing back of the inside portions of the end wall sections when the edges of the latter are brought into enga-gement with said locking= stops.

2. A box bla-nk comprising a central poil tion having inner and outer side wall seca tions pro-vided with tongue flaps at their ends, and end v,wall sections foldable over said flaps of the side wall sections, and locking stopshadhesively secured 'to the central portion, the end flaps of the outer wall sec tion being ofvless width than those of COW inner wall sections, and the -outer wall wotions having end recesses adjacent their end flaps and in their side edges nent to their ends. v

3. A' box member comprising a centra-l portion havin-g double-thick side walls provided with inwardly turned end flaps and double-thick end walls enclosing the end laps'of the side walls, edge portions of the end walls bearing on the central portion and locking stops secured to the central portion and overlapping the said edge portions of the end walls, the inwardly turned end tiene the relative prolll@ being proportioned to causethe lower inner portions ofthe end Walls to be exed back when said edge portions are engaged by the locking stops. fr l Y 4. That improvement in the methodof making lblanks for conversion into boxes having interlocked members, eonsistin in forming the blanks with extension tabs, olding the portions which carry the tabs onto inner 'portions of the blanks, securing the tabs to said inner portions and lthen cutting the material adjaeent to the secured areas.

5. That improvement in the .method of making blanks for conversion into boxes having interloeked members, lconsisting in ol'm- 1' ing the blanks With extension tabs, gfolding the YportionsAWhc-h carry the tabs onto inner ,portions of the blanks, adhesively se! curing predetermined areas ofthe4 tabs to saidinner portions of the blanks, then outting aoro the tabs at a predetermined distance from vtheir secured areas, and then trimming the. edges ofthe portions which originally carried the tabs..

In testimony whereof signature.

I have aflxed my 25 

